Final answer:
The correct step in the amendment process is ratification by 3/4 of the state legislatures after being proposed by Congress or a convention called by the states.
Step-by-step explanation:
The correct answer to the question of which step is part of the amendment process to the United States Constitution is ratified by 3/4 of the state legislatures. This is the second step in the amendment process, after an amendment has been proposed. The proposal stage requires a two-thirds supermajority vote in both the House of Representatives and the Senate or a convention called by two-thirds of the state legislatures. Once proposed, it must be ratified by three-fourths of the state legislatures, as outlined in Article V of the Constitution, to become law.